Date: Mon, 4 Dec 2006 15:11:25 +0200 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: freebsd-questions@freebsd.org Subject: Re: Is there a standard function for converting IP address to number? Message-ID: <20061204131125.GA60955@kobe.laptop> In-Reply-To: <20061204124550.GA1766@host.my.domain> References: <20061204124550.GA1766@host.my.domain>
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On 2006-12-04 14:45, a@zeos.net wrote:
> Is there a standard function converting four numbers to one 32-bit
> IP address?
>
> I mean a function like
>
> f(i, j, k, l) {
> return (((((i << 8) | j) << 8) | k) << 8) | l;
> }
That's not even a complete, usable function, but if you are looking for
a 'standard' function as in "part of libc already", the answer is no.
Try something like the
in_addr_t makeaddr(uint8_t, uint8_t, uint8_t, uint8_t);
function from this sample program:
http://people.freebsd.org/~keramida/files/addr.tar.gz
which looks like this:
#include <sys/types.h>
#include <netinet/in.h>
#include "addr.h"
in_addr_t
makeaddr(uint8_t a, uint8_t b, uint8_t c, uint8_t d)
{
return (htonl(((in_addr_t)a << 24) + ((in_addr_t)b << 16) +
((in_addr_t)c << 8) + (in_addr_t)d));
}
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